Heat Exchanger End Gasket 4” for MerCruiser 4 Cyl 3.7L- 65128, 18-0389, 27-99960

Heat Exchanger End Gasket 4" for MerCruiser 4 Cyl 3.7L

This heat exchanger end gasket provides a reliable seal for the end cap of the heat exchanger on MerCruiser 4 Cyl 3.7L engines, with OEM cross-reference numbers 65128, 18-0389, 27-99960.

Overview

This heat exchanger end gasket is designed to replace the worn gasket between the heat exchanger end cap and the housing on MerCruiser 4 Cyl 3.7L engines. It ensures a leak-free seal to maintain proper cooling system pressure, making it ideal for boat owners and marine mechanics performing routine maintenance. The gasket is a direct-fit replacement for OEM numbers 65128, 18-0389, and 27-99960.

Built For Performance

• Constructed from high-quality gasket material resistant to heat and coolant corrosion
• Precisely cut to match the 4-inch end cap diameter for a snug fit
• Replaces factory gasket to restore original sealing performance
• Engineered to withstand the pressure and temperature extremes of marine cooling systems
• Direct replacement for multiple OEM part numbers ensure compatibility

Fits These Machines

• for MerCruiser 4 Cyl 3.7L engines (includes models: 470, 485, 488, 898, 228, 260, 485, 488)

On-The-Job Use

• Commonly used when servicing the heat exchanger on inboard MerCruiser sterndrive engines
• Ideal for replacing the end gasket during coolant system overhaul or winterization
• Suitable for use on boats with MerCruiser 3.7L four-cylinder powerplants
• Used by marine technicians to prevent coolant leaks and overheating

Specs At A Glance

Good To Know

Q: Will this gasket fit other MerCruiser models? A: This gasket is specifically designed for the 4-inch end cap on MerCruiser 4 Cyl 3.7L engines; confirm your heat exchanger end cap diameter matches before ordering.

Q: Can I reuse the old gasket? A: No, gaskets are designed for one-time use; reusing an old gasket can lead to leaks and overheating, so always install a new gasket during service.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.